### The viscous Holmboe instability for smooth shear and density profiles. (arXiv:1911.09961v1 [physics.flu-dyn])

The Holmboe wave instability is one of the classic examples of a stratified shear instability, usually explained as the result of a resonance between a gravity wave and a vorticity wave. Historically, it has been studied by linear stability analyses at infinite Reynolds number, $Re$, and by direct numerical simulations at relatively low $Re$ in…